Calories are a poor metric for food because they measure heat, and the body's ability to utilize fuel for energy depends on mitochondrial function and metabolic health.

“just because is a measure of heat and just because you're putting something in your body that can be burned and that can create heat doesn't mean your body can utilize it if your mitochondria aren't working so just because you're putting a fuel in your body doesn't mean you can produce energy out of it if you're metabolically unwell”